As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD INFLIGHT T2329/31JAN - GEAR UNSAFE LIGHT ILLUMINATED DURING RETRACTION. CYCLED GEAR WITH NO HELP. RETURNED TO ORD AND LANDED WITHOUT INCIDENT. DOWN AND LOCKED INDICATIONS WERE GOOD. REPLACED NOSE LANDING GEAR STRUT. SYSTEM GROUND CHECKED NORMAL OPERATION.